Why guy say that he have someone he likes but doesn't tell who is it?

There is a guy who is quite outgoing but secretive about his personal life. One time, he messaged one of my colleague about what gift do women like so he can give to woman he likes. When my colleague asked about who the person he like is. He didn't reveal the name or anything related to person he likes. He just explained that he likes someone. Why doesn't he reveal who he likes? Does every guys does that?

Why guy say that he have someone he likes but doesn't tell who is it?
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